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Manipulation of Fibril Surfaces in Nanocellulose-based Hybrid Facilitated Transport Membranes for Enhanced CO2 Capture.

08:00 EDT 14th August 2019 | BioPortfolio

Summary of "Manipulation of Fibril Surfaces in Nanocellulose-based Hybrid Facilitated Transport Membranes for Enhanced CO2 Capture."

Nanocellulose is attracting more and more interests as a nanoscale 1D additive in polymeric membranes due to its natural availability, high aspect ratio, tunable surface, and excellent mechanical properties. In this work, an effective way to modify nanocellulose fibril surfaces for performance enhancement in CO2 separation membranes has been demonstrated. The functionalization promptly triggered intrinsic property responses in favour of nanofiber dispersion and CO2 transport. Thin composite membranes containing the modified nanofibers in water-swelling polyvinyl alcohol (PVA) as well as in the blend of sterically-hindered polyallylamine (SHPAA) and PVA were fabricated and tested using humid gas permeation tests. Defect-free ultrathin (300 nm) hybrid selective layers containing evenly distributed nanofibers were successfully coated. The addition of nanocellulose exhibited enhanced CO2 permeance and CO2/N2 selectivity compared to the neat PVA membranes; CO2 permeance up to 652 GPU with a CO2/N2 selectivity of 41.3 were documented. Functionalization plays a clear role in the dispersion of nanocellulose fibrils in the SHPAA/PVA blend, increasing the steric stabilization and interface compatibility with the polymer matrix. The tuned interface with PEG groups act as sites for water clusters retention and increased CO2 solubility, thus creating fast diffusion pathways for CO2 transport.

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This article was published in the following journal.

Name: ACS applied materials & interfaces
ISSN: 1944-8252
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